You can access your domain management functions in your ANA account client area.

From there you can view and change the current nameservers, change the lock status of your domain, change the auto renewal setting, order a renewal for your domain, and edit your contact information (this is the information that shows in Whois searches of your domain name).

Please note that these are minimal domain management functions but are sufficient for the majority of users. More domain management tools are available at most large registrars.